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US Pentagon on lockdown over reports of hazardous materials incident

US Pentagon on lockdown over reports of hazardous materials incident

Posted on June 11, 2026

A hazardous materials incident put the Pentagon on lockdown on June 11 as fire officials investigated an air quality issue. Pentagon spokesman Sean Parnell said the building’s safety systems detected the problem and that standard shelter-in-place protocols were activated while response teams worked to assess it.

Reports said people were evacuated from several floors, with access restricted on floors two through five in corridors four through seven. Emergency responders were also seen wearing gas masks and chemical protection suits, according to sources cited in the reports.

The Department is executing standard protection protocols, including a shelter-in-place order for the affected area. Response teams are in place and ready to support building occupants.”

Video from the Pentagon showing fire and EMS units from @ArlingtonVaFD and neighboring jurisdictions staging for a hazmat incident. The response was triggered by reports of an odor and possible detector activations.

Crews have been in extended standby while awaiting lab test… https://t.co/5KAmCmi80q pic.twitter.com/5nrAY6kneD

— Tony Seruga (@TonySeruga) June 11, 2026

The building was under lockdown, with people evacuated from several floors, CNN reported, citing unidentified sources.

Floors two through five in corridors four through seven have been locked down, CNN said, citing two sources.

Another source reported seeing emergency responders were wearing full gas masks and chemical protection suits, CNN said.

The building was under lockdown, with people evacuated from several floors, CNN reported, citing unidentified sources.

NEW: Pentagon employees have received the following notice this morning as the building has gone on lockdown due to a hazmat-related situation. pic.twitter.com/yCDEmpg7mc

— Aaron Parnas (@AaronParnas) June 11, 2026

Floors two through five in corridors four through seven have been locked down, CNN said, citing two sources.

Another source reported seeing emergency responders were wearing full gas masks and chemical protection suits, CNN said.

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